"Tipping my hat to my friends @littlebigtown for their single #girlcrush!" McEntire wrote on Friday.
In all the pics, the stars are wearing "Girl Crush" hats.
Kacey Musgraves got in on the action with a few friends.
"We Girl Crushin'.. @littlebigtown," she wrote.
"I have so much respect for Little Big Town and [producer] Jay Joyce ... to take chances like that and keep the genre going and moving, it requires bold artists," he added.
The song's co-writer Liz Rose also spoke to ABC News on Friday, saying that the one lyric doesn't mean the song is about two girls dating, but a girl is who is jealous of he ex-boyfriend's new woman.
"When we wrote it and it got played around town, the reaction was, 'Oh my God, this is our favorite song we've heard in a long time' and 'Thank you so much for writing such a great song,'" Rose told ABC News. "I think the negativity just came from a few places and that's what got out."